All threaded fasteners, fittings and connectors must be measured using accurate gaging methods to ensure the highest quality.

Blank specifications vary on straight threads and tapered pipe threads. When rolling a straight thread, machine the part's blank diameter to the maximum pitch diameter - .002 inch. Roll the thread until the pitch diameter is within specification — between the pitch diameter's maximum and minimum — and adjust the blank diameter until the major diameter is within specification — between the major diameter's maximum and minimum.

Working in the thread rolling industry for over 60 years, CJWinter has seen its fair share of thread rolling problems of all types.

Blank diameter, material type, and rate of penetration all play major roles in the performance of your thread rolling solution. Over the years, we identified the most common thread rolling issues and developed a series of solutions to address any challenge.

Of all the thread rolling problems we see on a regular basis, the following five represent the most common issues — and our recommended solutions to address them.

1. Slivers / Flakes

The appearance of slivers or flakes within threads can indicate a number of potentially problematic causes. First
, check to see if rolls are mismatched, overfilled, or of the incorrect diameter. It’s possible that rolls need to be resynchronized or the blank diameter needs to be reduced to correct the problem.

CJWinter has pioneered the thread rolling sector throughout our 60 years in the industry. Today, we are proud to introduce our latest innovation: a brand new website with instant data and a streamlined ordering process.

Different materials have different forming characteristics during the thread rolling process. High sulfur, for example, can create flakes and slivers, thereby hindering the thread finish during cold forming.

The solution: Easy Metal Flow Tooth forms — a special form that concentrates forces at the root of the thread form, which helps plow material more efficiently during the cold form process. Ultimately, the increased and concentrated force minimizes, and in most cases eliminates, flakes from being produced when rolling brass, high sulfur, and other materials prone to flaking.